[llvm] [InstSimplify] Simplify the expression `(a^c)&(a^~c)` to zero and (a^c) | (a^~c) to minus one. (PR #76637)

[Nikita Popov via llvm-commits]

https://github.com/nikic approved this pull request.

LGTM

For the future, note that the second commit should contain test diffs. It seems like you committed the final test results directly into the first commit.

https://github.com/llvm/llvm-project/pull/76637